Disaster Recovery

RTO: Recover Time Objective (Down time) RPT: Recover Point Objective (Data loss)

• strategies
  • Backup and restore
  • Pilot light
    • run a small version of the app
    • useful for the critical core
  • warm standby
    • full system is up, but at minimum size
  • hot site / multi site approach

DMS - Database Migration Service

• Quickly and securely migrate databases to AWS, resilient, self healing
• The source database remains available during the migration
• Supports:
  • Homogeneous migrations: ex Oracle to Oracle
  • Heterogeneous migrations: ex Microsoft SQL Server to Aurora
• Continuous Data Replication using CDC
• You must create an EC2 instance to perform the replication tasks
• sources
  • on-premises and EC2 databases - Oracle, MSSQL Server, MySQL, MariaDB, PostgreSQL, MongoDB, SAP, DB2
  • Azure SQL Database
  • Amazon RDS, Aurora
  • Amazon S3
  • DocumentDB
• targets
  • on-premises and EC2 databases - Oracle, MSSQL Server, MySQL, MariaDB, PostgreSQL, SAP
  • Amazon RDS
  • Redshift, DynamoDB, S3
  • OpenSearch
  • Kinesis Data Streams
  • Apache Kafka
  • DocumentDB & Neptune
  • Redis & Babelfish
• AWS Schema Conversion Tool (SCT)
  • Convert your Database’s Schema from one engine to another
  • prefer compute-intensive instances to optimize data conversions
• Continuous Replication
• multi-AZ deployments
  • DMS provisions and maintains a synchronously stand replica in a different AZ
  • advantages
    • provides data redundancy
    • eliminates IO freezes
    • minimizes latency spikes

On-Premise strategy with AWS

• Ability to download Amazon Linux 2 AMI as a VM (.iso format)
  • VMWare, KVM,VirtualBox (Oracle VM), Microsoft Hyper-V
• VM Import / Export
  • Migrate existing applications into EC2
  • Create a DR repository strategy for your on-premisesVMs
  • Can export back the VMs from EC2 to on-premises
• AWS Application Discovery Service
  • Gather information about your on-premises servers to plan a migration
  • Server utilization and dependency mappings
  • Track with AWS Migration Hub
  • Agent-less Discovery (AWS Agent-less Discovery Connect)
  • Agent-based Discovery (AWS Application Discovery Agent)
• AWS Database Migration Service (DMS)
  • replicate On-premise => AWS , AWS => AWS, AWS => On-premise
  • Works with various database technologies (Oracle, MySQL, DynamoDB, etc..)
• AWS Server Migration Service (SMS)
  • Incremental replication of on-premises live servers to AWS

AWS Backups

• Fully managed service
• Centrally manage and automate backups across AWS services
• No need to create custom scripts and manual processes
• Supported services
  • Amazon EC2 / Amazon EBS
  • Amazon S3
  • Amazon RDS (all DB engines) / Amazon Aurora / Amazon DynamoDB
  • Amazon DocumentDB / Amazon Neptune
  • Amazon EFS / Amazon FSx (Lustre & Windows File Server)
  • AWS Storage Gateway (Volume Gateway)
• Supports cross-region backups
• Supports cross-account backups
• Supports PITR for supported services
• On-Demand and Scheduled backups
• Tag-based backup policies
• You create backup policies known as Backup Plans
  • Backup frequency (every 12 hours, daily, weekly, monthly, cron expression)
  • Backup window
  • Transition to Cold Storage (Never, Days,Weeks, Months,Years)
  • Retention Period (Always, Days,Weeks, Months,Years)
• Backup Vault Lock

Others

• Application Discovery Service
  • plan migration projects by gathering information about on-premises data centers
  • server utilization data and dependency mapping are important for migration
• Application Migration Service (MGN)
• VMware Cloud on AWS
• CloudFormation
  • AWS version K8S
  • Infra as Code
• SES (Simple Email Service)
  • Fully managed service to send emails securely, globally and at scale
  • Allows inbound/outbound emails
• PinPoint
  • scalable 2-way (in/out) marketing communication service
  • supports
    • Email
    • SMS
    • push
    • voice
    • in-app messages
• Systems Manager
  • SSM Session Manager
    • allows you to start a secure shell on your EC2 and on-premises serves
    • SSM Agent install on host
  • Run Command
  • Patch Manager
  • Maintenance Windows
  • Automation
• AWS Cost Explorer
  • Visualize, understand, and manage your AWS costs and usage over time
  • Create custom reports that analyze cost and usage data.
  • Analyze your data at a high level: total costs and usage across all accounts
  • Or Monthly, hourly, resource level granularity
  • Choose an optimal Savings Plan (to lower prices on your bill)
  • Forecast usage up to 12 months based on previous usage
• AWS Elastic Transcoder
  • convert media files stored in S3 into media files in the formats required by consumer playback devices
• AWS Batch
• AWS AppSync
  • GraphQL API
• Amazon AppFlow
  • AppFlow allows users to securely transfer data between AWS services and SaaS (Software as a Service) applications without the need for custom code. It simplifies the process of integrating data between different systems, making it easier for organizations to set up and manage data flows.
• AWS Amplify
  • AWS Amplify is a set of tools and services provided by Amazon Web Services (AWS) to help developers build scalable and secure cloud-powered applications. It simplifies the process of developing full-stack applications by providing a set of libraries, UI components, and a command-line interface (CLI) for building and deploying applications.

Terminologies

• Re-platforming is a migration strategy where you don’t change the core architecture but leverage some cloud optimizations.
• Re-hosting refers to a migration strategy where no cloud optimizations are done and the application is migrated as it is.